Appendix: On the Unix end

There are several things that need to be correctly set before you can
run plotdata. The Unix shell (the supervisor that interprets and
performs your Unix commands) on spartan needs to be told what type
of terminal you are on, what type of hardcopy output device you have,
and where on the system disk are the files required by plotdata.
Hopefully, your .login file
has made these
determinations for you. To check, issue the Unix command setenv;
it will report the list of the so-called environment variables
that are currently
set. If you do not see the right definitions (see below), here's what
you may need to type at the shell prompt, before starting
up plotdata: